Polish "Add transactionIdPrefix Property to KafkaTemplate"

See gh-29089

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/kafka/KafkaAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -67,7 +67,6 @@ public class KafkaAutoConfiguration {
 	public KafkaTemplate<?, ?> kafkaTemplate(ProducerFactory<Object, Object> kafkaProducerFactory,
 			ProducerListener<Object, Object> kafkaProducerListener,
 			ObjectProvider<RecordMessageConverter> messageConverter) {
-
 		PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
 		KafkaTemplate<Object, Object> kafkaTemplate = new KafkaTemplate<>(kafkaProducerFactory);
 		messageConverter.ifUnique(kafkaTemplate::setMessageConverter);

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/kafka/KafkaProperties.java

@@ -825,7 +825,8 @@ public class KafkaProperties {
 		private String defaultTopic;
 
 		/**
-		 * Override the transaction id prefix in the producer factory.
+		 * Transaction id prefix, override the transaction id prefix in the producer
+		 * factory.
 		 */
 		private String transactionIdPrefix;